Proctor by Indeed - Proctor is a A/B testing framework written in Java.
SiteGainer - SiteGainer is an A/B testing and conversion optimization platform.
Pagewiz - An innovative landing page platform that lets you create, publish, and split-test landing pages.
invesp Pii Testing Engine - invesp Pii testing engine offers A/B testing solution for site optimization.
Optimizely - A/B testing you'll actually use.
Lander - Lander is a powerful online tool to create Landing Pages.